Dynamo-electric machine.



No. 881,456. I PATENTED MAR. 10, 1908.

H, BERG.

DYNAMU ELECTRIC MACHINE.

APPLIGATION FILED AUG. 8. 1906.

' convenient points UNITED STATES PATENT OFFICE.

' HENRY BERG, 'OF ORANGE; NEW JERSEY.

DYNAMO-ELECTRIC moi mm.

scri tion, such as will enable others skilled in t e art to which it appertains to make and use the same.

Hitherto it has been proposed to rovide the armature of adynamo or motor with a set of fan or propeller blades of such a pitch as to direct a current of air between the armature and field magnets and thus cool the motor or dynamo, but this plan is ob'ectionable for the reason that dust, dirt an other debris are blown into the machine, so that it is liable to shortcircuit or otherwise clog up the machine.

By'my construction, the draft is away from the machine so that the dirt etc., isdriven away and thus short-circuiting or clogging is avoided, while the current of air passing as itdoes over the parts in which there is a tendency to overheat, keeps such parts at a temperature but slightly above the normal. In the accompanying drawings forming a part of this specification. Figure 1. illus trates a common form of induction motor showing my improvement secured to the armature. Fig. 2. is an enlarged broken view of the same. Fig. 3. is a section on line a. of Fig. 2. Fig. 4. is a detached lan view. Fi 4;. is an end view. .Fig. 5. is a longitudi- 'na section showing the angle of the fan or wing. Fig. 6. illustrates a modification.

Like letters of reference refer to like parts throughout the drawings and specification. In carrying out my invention I secure at on the ends of'the armature A the'wings or fans B by means ofbolts, screws or rivets as shown in Fig; 2. The end B of the fan is bentat an angle of about 45 from the plane of the base thereof so that during the rotation of the armature in the direction indicated by the arrow, the air con- ;tiguous to the machine is driven away from W it and a constant current is set up which ourrent enters the machine adjacent to and around the armature shaft, and is imme- Specifination of Letters Patent.

Application 11106. August 8, 1905.

[construct the ring portion of them. plied to dynamos and motors of any ty e bination with the field magnets and a Patented March 10, 1908 Serial No. 273,249.

diately directed away from the ends of the armature, and carries with it all dust, dirt etc. which might otherwise accumulate within and around the armature. In practice I find that two of these fans or wings secured to each end of the armature of a motor of the type shown will keep the temperature down to the vicinity of 100 F. whereas rior to their use, and under the same conditions the temperature of the armature and surrounding parts would run up as high as 160 to 170 F. and even higher. I have shown the wingsB as secured to the supporting rin s C, between adjacent ventilating blades on the supporting ring E. I may, however,

E .and the wings B integral as shown in Fig. 6, and dispense with the ventilating blades D, entirely or with a These fans may be apand be equally efiicacious in keeping t e same cool, and free from dust dirt etc. What I claim is: 1. In a 1 dynamo electric machine, the combination ofa solidring armature with a series of fans or wings attached to each end of said armature adjacent to its periphery,

said fans or wings being inclined away from the direction of rotation of said armature.

2. In a dynamo electric machine, the combination with field magnets and a solid ring armature, of fans or wings upon each end of said armature adjacent to its 1 periphery adapted to create a current ofair away from each end of said armature during the rotation thereof. I

3. In a dynamo electric machine, the comsolid ring armature, of fans or wings upon each end of said armature'adjacent to its periphery, said fans or wings being inclined away from the direction of rotation of said armature, whereby upon the rotation of the same a cur rent of air is created in a direction parallel with the axis of and away from eachend of said armature. 1

4. A clearing and cooling device for dynamo electric machines having a solid r ng armature comprismg a series of inclined fans or wings secured to said fans or wings designed to create a current of air away from from the direction of motion of said arms each. end of the armature. ture. in 5. A clearing and cooling device for dyna- This specification signed and witnessed this I 1110 electric machines-having a solid ring ar- 4th day of August 1905. 5 mature comprising fans or Wings secured to HENRY BERG.

each end of said armature adjacent to its Witnesses: periphery, said fans or wings consisting of 1 FREDK C. FISCHER,

fiat metallic plates bent at an angle away VALENTINE FRICKEL. 

